Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 1, Issue 38, Pages 6099-6102Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2tc00794k
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Funding
- HDTRA [1-10-1-0044]
- NSF [0932901]
- AFOSR (Natural Materials and Systems & Extremeophiles Program) [FA 9550-10-1-0329]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0932901] Funding Source: National Science Foundation
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We report on a novel self-driven climbing of two-dimensional (2-D) ordered monolayer crystalline colloidal arrays (CCAs). This phenomenon can be used to rapidly and efficiently prepare large area, highly ordered 2-D array monolayer CCA films on various substrates. Large area 2-D polystyrene (PS) particle CCAs were fabricated on water surfaces by a needle tip flow technique. Introduction of a wet substrate through the 2-D particle monolayer array on the water surface causes the 2-D array to flow onto the wet substrate surface due to a surface spreading pressure. This method can quickly prepare ordered 2-D particle arrays on numerous wet substrates including flat/curved glass slides, inner walls of glass tubes, hydrogels, flexible polymer films, patterned surfaces, etc. By using responsive hydrogels as substrates, we can conveniently prepare 2-D photonic crystal sensors that can be used to visually determine analyte concentrations. For example, we prepared 580 nm PS 2-D arrays on poly(2-hydroxyethyl methacrylate) hydrogels to sense ethanol in water.
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